Hello, I have a little problem. I want to speedrun penumbra and I read that I need to put penumbra in window mode so I can see LiveSplit. But when I change that in the settings and I launch penumbra the window appears in the middle of my screen. Can someone help me please ?

The easiest way I've found is to have a smaller window above it, such as task manager or live split and tab into it with alt+tab which will allow you to grab the top of the penumbra window. As long as penumbra isn't in focus you should be able to move it around freely, otherwise the mouse cursor will be locked into the game.